version: '3.1'

services:

  mongo:
    image: docker.io/mongo
    restart: always
    environment:
      MONGO_INITDB_ROOT_USERNAME: root
      MONGO_INITDB_ROOT_PASSWORD: example
    ports:
      - 27017:27017
    command: mongod --replSet rs0 --keyFile /opt/keyfile/mongodb-keyfile
    volumes:
      - ./:/opt/keyfile/

# docker run --rm -it --network=host --name mongoContainer mongo:latest mongosh mongodb://127.0.0.1:27017 -u root -p example --eval "rs.initiate({'_id':'rs0', members: [{'_id':1, 'host':'127.0.0.1:27017'}]})"